25Cr-22Ni-2Mo Bolts

S31050, X1CrNiMoN25-22-2,310MoLN, UREA 25.22.2

Stainless steel UNS S31050 is a fully austenitic stainless steel that does not have intermetallic phases such as intergranular carbide precipitations. Stainless steel UNS S31050 has an optimized chemical composition designed specifically for applications in urea plants. The nitrogen in the chemical composition helps to stabilize and strengthen the austenitic phase. This material provides improved corrosion-resistance in urea carbamate environments such as high-pressure strippers.

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25cr-22ni-2mo Fasteners 1.4466 Studs 25cr-22ni-2mo Nuts X1CrNiMoN25-22-2 Washers UNS S31050 Screws AISI 310MoLN Bolts 25cr-22ni-2mo Threaded Rod 25cr-22ni-2mo Forgings

25Cr-22Ni-2Mo Bolt Properties

25Cr-22Ni-2Mo Bolts Chemical Requirements

Steel designation		% by mass ^a
Name	Number	C	Si	Mn	P	S	Cr	Mo	Ni	N	Cu	Others
X1CrNiMoN25-22-2	1.4466	0.020	0.70	2.00	0.025	0.010	24,0 to 26,0	2,00 to 2,50	21,0 to 23,0	0,10 to 0,16	-	-
Elements not quoted in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addition of such elements from scrap and other materials used in production which would impair mechanical properties and the suitability of the steel. a Maximum values unless indicated otherwise. b Particular ranges of sulfur content may provide improvement of particular properties. For machinability a controlled sulfur content of 0,015 % to 0,030 % is recommended and permitted. For weldability, a controlled sulfur content of 0,008 % to 0,030 % is recommended and permitted. For polishability, a controlled sulfur content of 0,015 % max. is recommended. c Where for special reasons, e.g. hot workability for the fabrication of seamless tubes where it is necessary to minimize the delta ferrite content, or with the aim of low magnetic permeability, the maximum Ni content may be increased by the following amounts: *) Patented steel grade.

25Cr-22Ni-2Mo Bolts Mechanical Requirements

Mechanical properties at room temperature of solution annealed a Austenitic steels and resistance to intergranular corrosion in conditions 1C, 1E, 1D, 1X, 1G and 2D

Steel designation			Thickness t or diameterb d mm	Hard-nessc, d HBW max.	0,2 %- proof strengt h e Rp0,2 MPa*) min.	1 %- proof strength c,e Rp1,0 MPa*) min.	Tensile strengthd, e Rm MPa*)	Elongation after fractured, e A % min.		Impact energy (ISO-V) KV2 J min.		Resistance to intergranular corrosionf
Type	Name	Number						Elongation after fractured, e A % min.		Impact energy (ISO-V) KV2 J min.		in the delivery condition	In the sensi-tized con-ditiong
Type	Name	Number						(long.)	(tr.)	(long.)	(tr.)	in the delivery condition	In the sensi-tized con-ditiong
Special grades	X1CrNiMoN25-22-2	1.4466	≤ 160	240	250	290	540 to 740	35	-	100	-	yes	yes
Special grades	X1CrNiMoN25-22-2	1.4466	160 < t ≤ 250	240	250	290	540 to 740	-	30	-	60	yes	yes
For bigger sizes the mechanical values shall be agreed at the time of enquiry and order. a Solution treatment may be omitted if the conditions for hot working and subsequent cooling are such that the requirements for the mechanical properties of the product and the resistance to Intergranular corrosion as defined in EN ISO 3651-2 are obtained. b Width across flats for hexagons. c Only for guidance. d The maximum HB-values may be raised by 100 HB or the tensile strength value may be raised by 200 MPa and the minimum elongation value may be lowered to 20 % for sections and bars of ≤ 35 mm thickness having a final cold deformation and for hot formed sections and bars of ≤ 8 mm thickness. e For rods, only the tensile strength values apply. f When tested according to EN ISO 3651-2. g See NOTE 2 to 6.4. h Sensitization treatment of 15 min at 700 °C followed by cooling in air. *) 1 MPa = 1 N/mm2

Tensile strength of wire in diameters of 0,05 mm and above in 2H condition

Steel designation ^{b, c}		Tensile strength levels	Range of tensile strength ^d MPa*)
Name	Number	Tensile strength levels	Range of tensile strength ^d MPa*)
Austenitic steels
X1CrNiMoN25-22-2	1.4466	+C500	500 to 700
		+C600	600 to 800
		+C700	700 to 900
		+C800	800 to 1000
		+C900	900 to 1100
		+C1000	1000 to 1250
		+C1100	1100 to 1350
		+C1200	1200 to 1450
		+C1400	1400 to 1700
		+C1600	1600 to 1900
		+C1800	1800 to 2100
a For spring applications, see EN 10270-3. For cold heading, see EN 10263-5. b Not all grades are available in all tensile strength levels or all diameters. Guidance data for nominal dimensions d depending on strength levels are given in Annex B. c Elongation depends on nominal dimensions d and may be agreed upon at the time of enquiry and order. d Intermediate values may be agreed. *) 1 MPa = 1 N/mm2

Mechanical properties at room temperature of annealed wire in 2D condition ^a,b

Steel designation		Nominal dimension ^d mm	Tensile strength MPa*) max.	Elongation % min.
Name	Number	Nominal dimension ^d mm	Tensile strength MPa*) max.	Elongation % min.
Austenitic steels (+AT)^c
X1CrNiMoN25-2	1.4466	0,05 < d ≤ 0,10	1100	20
		0,10 < d ≤ 0,20	1050	20
		0,20 < d ≤ 0,50	1000	30
		0,50 < d ≤ 1,00	950	30
		1,00 < d ≤ 3,00	900	30
		3,00 < d ≤ 5,00	850	35
		5,00 < d ≤ 16,00	800	35
a If skin passed (i. e. less than 5 % reduction in cross section), the maximum tensile strength might be increased by up to 50 MPa. b For cold heading, see EN 10263-5. c +A = annealed, +AT = solution annealed. *) 1 MPa = 1 N/mm2

Minimum values for the 0,2 %-and 1 %-proof strength of austenitic steels at elevated temperatures

Steel designation		Heat treatment condition ^a	Minimum 0,2 %-proof strength (Rp 0,2) (MPa*))										Minimum 1 % proof strength (Rp 1,0) (MPa*)
Name	Number		at a temperature (in °C) of
Name	Number		100	150	200	250	300	350	400	450	500	550	100	150	200	250	300	350	400	450	500	550
X1CrNiMoN25-22-2	1.4466	+AT	195	170	160	150	140	135	-	-	-	-	225	205	190	180	170	165	-	-	-	-
a +AT = solution annealed b This grade is intended to be used at room temperature in the cold work hardened condition. Therefore, values for proof strength at elevated temperatures are not available. In cases where this grade is used in the solution annealed condition, the values of grade X5CrNi18-10 (1.4301) can be adopted. *) 1 MPa = 1 N/mm2

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